Question

Stabiliti daca intre multimile urmatoare exista o proportionalitate directa sau inversa si in cazul afirmativ , determinati coeficientul de proportionalitate :
a) A={4;10,14} B={12;30;42}
b) A={4;6;12}  B={30;20;10}


Pentru confectionarea a 12 rochii se folosesc 36 metrii de stofa.

a) Cati metri de stofa sunt necesari pt. confectionarea a 50 de rochii
b) Cate rochii pot confectiona din 1191 m de panza

b3ab4eeaf881325ac47dee4bb3296b33.txt

Answer 1

a)4/12=10/30=14/42=k
k=4/12            k=10/30....
k=1/3
deci sunt direct proportionate
4/12=10/3=14/42  simplificate dau fiecare 1/3
b)4·30=6·20=12·10=k
k=120
sunt iners proportionale
a)  36m--------------12 rochii
     x------------------50 rochii
x=50·36/12=150 m

b)36m-----------------12r
 1191m------------------x
x=12·1191/36=393 rochii